For problems related to media (video/audio) -- especially when the reporter is not sure which area of the media stack the problem is in. This category will mostly be for untriaged video/audio issues. Bugs in this category will typically be moved to another media category during the triage process.

Created attachment 8534964[details]
Minimal test case to reproduce the issue
I found difference between Firefox and Chrome behavior while fixing the bug 1108796. Looks like Chrome does not perform anything in appendChild if the child element is already in its place in the DOM; e.g. div.appendChild(video); will not stop the video if it is already appended to the div. For comparison, the video stops in Firefox.